Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual é o valor da Alternativa Democrática para a pesquisa divulgada pelo Malta Today?
 ###Tabelas: CREATE TABLE writing (writing_id AUTO_INCREMENT PRIMARY KEY, gzip VARCHAR, bzip2 VARCHAR, LHA/LZH VARCHAR, StuffIt VARCHAR, StuffIt X VARCHAR, ISO/CD Image VARCHAR) CREATE TABLE membership (membership_id AUTO_INCREMENT PRIMARY KEY, School VARCHAR, Location VARCHAR, Mascot VARCHAR, County VARCHAR, Year Joined INT, Previous Conference VARCHAR, Year Left INT, Conference Joined VARCHAR) CREATE TABLE top_10_games_of_400_or_more_yards_by_category (top_10_games_of_400_or_more_yards_by_category_id AUTO_INCREMENT PRIMARY KEY, Rank VARCHAR, Rating VARCHAR, Completion Percentage VARCHAR, Touchdown Percentage VARCHAR, Yards Per Attempt VARCHAR, Total Yards VARCHAR) CREATE TABLE "sandy_bridge_quad-core"_32_nm ("sandy_bridge_quad-core"_32_nm_id AUTO_INCREMENT PRIMARY KEY, Model number VARCHAR, sSpec number VARCHAR, Cores VARCHAR, Frequency VARCHAR, Turbo VARCHAR, L2 cache VARCHAR, L3 cache VARCHAR, GPU model VARCHAR, GPU frequency VARCHAR, Socket VARCHAR, I/O bus VARCHAR, Release date VARCHAR, Part number(s) VARCHAR, Release price ( USD ) VARCHAR) CREATE TABLE opinion_polls (opinion_polls_id AUTO_INCREMENT PRIMARY KEY, Date(s) Released VARCHAR, Polling institute VARCHAR, Nationalist VARCHAR, Labour VARCHAR, Democratic Alternative VARCHAR, Undecided/ No answer VARCHAR, Lead VARCHAR)  
SELECT Democratic Alternative FROM opinion_polls WHERE Polling institute = malta today